Lead-free partial fragmentation bullet with separation mechanism between the rear of the bullet and bullet ogive

ABSTRACT

The invention relates to a lead-free partial fragmentation bullet comprising a bullet jacket, a rear core compressed therein, and a nose core compressed in the ogive region, wherein the tip core sits on the rear core. In order that the rear core does not separate from the contacting bullet jacket upon striking a target body and to thereby guarantee a sure exit wound out of the target body, a predetermined breaking point is proposed which is arranged between the rear core and the nose core. The rear core has a molded recess on the end thereof facing the nose core, the end of the nose core facing the tail core fills in said recess, and the bullet jacket has a peripheral break away edge on the outer circumference in the region of the predetermined breaking point.

The invention relates to a lead-free partial fragmentation bullet, consisting of a bullet jacket, a rear core pressed into it and a pressed nose core in the ogive region, wherein the nose core sits on the rear core.

The object of the invention is to improve upon a lead-free partially fragmenting bullet, so that when it impacts a target body, the rear core does not detach itself from the adjacent bullet jacket and therefore a more reliable exit wound out of the target body is ensured.

According to the invention this object is achieved by a lead-free partially fragmenting bullet having the features of claim 1.

Due to the fact that a predetermined breaking point is provided between the rear core and the nose core, wherein the rear core has a shaped recess on its end facing the nose core, filling out the end of the nose core facing the rear core and the bullet jacket has a peripheral tear-away edge on its outside circumference in the region of the predetermined breaking point, the bullet jacket begins to fragment in the region of the ogive up to the tear-away edge and the predetermined breaking point on impact with a target body. When a sufficient force is applied to the deformed bullet jacket, it is separated from the remainder of the bullet jacket by the tear-away edge. Then the rear core begins to deform due to shaped recess and covers the region between the jacket and the core.

The rear core and/or the nose core may also consist of partial cores. The shaped recess is then situated in the top rear part.

The shaped recess is preferably a cone. A cone can be introduced without any problems and facilitates the fragmentation process.

The break-away edge is arranged between the beginning and the end of the predetermined breaking point as seen in the axial direction. The break-away edge delimits the fragmentation process.

Peripheral holding groove is preferably provided on the bullet jacket in the direction of the bullet base beneath the break-away edge. The holding groove causes the bullet jacket and the rear core to hold together until the start of the mushrooming process of the rear core.

The invention is explained in greater detail below on the basis of two figures.

FIG. 1 shows a lead-free partial fragmentation bullet according to the invention, consisting of a bullet jacket 1, a rear core 2, a nose core 3 in the ogive region and a separation mechanism 12 between the nose core 3 and the rear core 2. The fragmentable part of the bullet consisting of the nose core 3 and the adjacent bullet jacket is labeled with reference numeral 5. The remaining non-fragmentable body of the bullet is labeled with reference numeral 6 and consists of the rear core 2 and the adjacent bullet jacket.

All readily deformable materials, preferably Cu, MS, ST, may be used as the materials of the bullet jacket. All pressable lead-free materials, e.g., Sn, Zn, including granules, or cores permeated with predetermined breaking points, as described in DE 10 2012 023398 A1, are suitable as the core materials.

The separation mechanism is an interaction between the shaped recess in the rear core, i.e., the shaping in the pressed rear core of the bullet and the break-away edge 8 in the bullet jacket.

In the rear core 2, the shaped recess 7 is pressed into the bullet jacket 1 in pressing, such that the recess consists of a cone or any other shape, the important thing being that it is a shaped recess. Next, the nose core 3, which is responsible for the fragmentation, is introduced into the bullet jacket 1 and pressed. The important recess 7, which is formed there, remains as a predetermined breaking point. After finishing the bullet, a break-away edge 8 is worked into the bullet jacket 1. All shapes, which ensure a reliable break-away of the bullet jacket 1 in the area of the break-away edge 8, may be used as the shape of the break-away edge 8. The position of the break-away edge 8 is between the beginning and the end of the shaped recess in the rear core. Only in this way are the function and mechanism of action of the bullet ensured.

On impact of the lead-free partial fragmentation bullet with a target body (e.g., game animal), the bullet jacket 1 and the nose core 3 begin to fragment all the way to the break-away edge 8 and the recess 7 in the rear core 2. If the force applied to the deformed bullet jacket is insufficient, the jacket will separate from the rest of the bullet at the break-away edge 8.

Then the recess 7 in the rear core 2 begins to deform (see FIG. 2, reference numeral 9) and covers the region 10 between the bullet jacket 1 and the rear core. Depending on the properties of the jacket geometry or jacket material, a holding groove 11 (see FIGS. 1 and 2) may also be accommodated beneath the break-away edge 8, causing the bullet jacket and the rear core to be held together until the start of the mushrooming process in the rear core. No target medium can penetrate into this region. This ensures that the bullet jacket and rear core will remain together to form a compact bullet body, which contributes toward a reliable exit wound from the target body.

If no recess 7 were created in the rear core, the region 10 (see FIG. 2) between the bullet jacket 1 and the rear core 2 would not be covered. The target medium would penetrate, the rear core 2 would separate from the bullet jacket and the mechanism of action of the bullet would no longer be ensured. 

1. A lead-free partial fragmentation bullet consisting of a bullet jacket, a rear core pressed into it and a pressed nose core in the ogive region, where the nose core sits on the rear core, characterized in that a predetermined breaking point is arranged between the rear core and the nose core, wherein the rear core has a shaped recess on its end facing the nose core, filling up the end of the nose core facing the rear core, and the bullet jacket has a peripheral break-away edge on its outside circumference in the region of the predetermined breaking point.
 2. The partial fragmentation bullet according to claim 1, wherein the rear core and/or the nose core consist of partial cores.
 3. The partial fragmentation bullet according to claim 1, wherein the shaped recess is a cone.
 4. The partial fragmentation bullet according to claim 1, wherein the break-away edge is arranged between the beginning and the end of the predetermined breaking point, as seen in the axial direction.
 5. The partial fragmentation bullet according to claim 1, wherein a peripheral holding groove is provided on the bullet jacket in the direction of the base of the bullet beneath the break-away edge. 